名词
中文翻译：备用照明
同义词：
['standby power', 'backup lighting']
例句：
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1.The emergency generator is a standby lighting system that can be used in case of power outages.
紧急发电机是一种备用照明系统，可以在停电时使用。
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2.The office has a backup lighting system in place to ensure safe working conditions during power outages.
办公室已经安装了备用照明系统，以确保在停电期间工作安全。
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3. The construction site has a standby lighting system in place to provide emergency lighting during the construction process.
施工现场已经安装了备用照明系统，以提供施工过程中的紧急照明。